I upgraded my computer from Vista to Windows 7 and it works fantastic except for one thing. When I play videos they all have problems with audio being out of sync, visually there is some lagging, and there are waves that run through the videos too that are weird and glitchy. I know that the video files are all completely fine because I've played them on other computers. I know that it is not the video player because I've tested 4 different ones. This is obviously a Windows 7 problem, but I'm not really sure what the problem is. Please Help!

Are drivers installed for the video adapter? Most computers automatically download video drivers from Microsoft Updates, but depending on your video adapter chipset, it may not. Some video drivers from Vista also are not fully compatible in Windows 7. That's my first guess without any other details.

I downloaded all the latest Drivers for my laptop, I installed the video codecs, I went to Toshiba's website and downloaded the current drivers for Win 64 bit (I have a 64 bit system and I checked) and still have the same stuttering and lagging effect when I play movies on my computer. Any other Ideas?

What is Your video player? I advice You to test also with VLC Media Player and
Windows Media Player Classic.

The reason can be that Your processor works too hard.
Check that from Task Manager's (press ctrl+alt+del)
Performance tab - CPU Usage should be under 50% during
playing video and if it is more so try to stop all other
programs and disable all visual effects of the Windows
or buy more RAM and/or better processor and/or
better graphics card and/or faster hard drive.

What is Your video player? I advice You to test also with VLC Media Player and
Windows Media Player Classic.

I only ever use VLC Media Player. It's an excellent player. As long as your computer's hardware can handle the video file, VLC can read just about any type of video/audio file (DVD, Disc Image Files, MKV, AVI, MOV, MP4, MP3, WAV,... etc.) without any additional software/codecs needing to be installed. This will definitely help rule out codec & most software issues.

Could you provide a screen shot of your task manager and perhaps even take a look at your event log and see if there are any repetitious errors? I have seen weird extreme lag problems on computers that have ended up being due to a broken or failing service continuously restarting in the background.

To check the event log, click on Start, and in the search box type: eventvwr.msc
Without pressing enter, you should see a search result appear for "Event Viewer" or "eventvwr.msc". Click on this. You then whant to expand the "Windows" log folder on the left side. The two log files that contain any useful information will be the Application log and the Event log. We are primarily looking for Red Error indicators. Double click on an entry to see it's details. If there are some repeated errors, screen shot one of them and post here.

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